Downgrade OS

4 replies
14315 views

FortiWiFi 60E - OS 5.4.1

How can I backup entire OS, or whatever be needed to upgrade to higher OS version, and be able to downgrade to my previous OS if I consider it is better/needed for me.

Regards

ede_pfau

SuperUser

If the current version added features or changed the syntax of some commands then a downgrade would most likely result in a loss of configuration.

I would do the downgrade with the USB stick method: place the old config file and the old firmware image on a FAT32 USB stick (max. 4 GB), connect it to the FGT, and enable the automatic upgrade (System>Advanced>Auto-install). This way, as the versions on the stick have precedence, first the old firmware is installed and then the old config. Reboots automatically, several times.

Phil_M

New Member

sorry to Hijack the thread.

I am looking to downgrade the firmware on a 50E (long story) I'm not worried about keeping any configuration. So if I stick 5.6.2 on a USB and reboot the fortigate it will install that firmware? If i haven't got a config file do I need to disable "Detect Configuration" in system>advanced>auto-install or will it just ignore it if it doesn't find one?

thanks

Phil

rwpatterson

New Member

If you don't care about the pre-existing configuration, I would do a factory-reset, then downgrade away. If you get errors in the current version due to commands existing in the newer code, then factory reset once again.

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